How did you create the choice? The correct way is to right-click the State field label, then choose Configure Choices. Give the choice a label, value, and apply it to the Story table - click the Add button, then Save to return to the Story form.
The new State will only appear on the Story form drop-down, not Incident, Change,... everywhere else State is used.
Notice when you Configure Dictionary the field shows that it actually resides on the Task table, not rm_story.
Changing anything on the Dictionary Entry will affect EVERY appearance of the field. What you need to do in the case of making a field mandatory or read only, changing a reference qualifier (for reference or list fields), attributes, etc. is to create a Dictionary Override for that one specific table.
Creating the choice as I outlined is like creating a Dictionary Override for choice values, since it adds the choice(s) to the sys_choice table with rm_story as the Table, instead of Task - which also makes it available to all extended tables (story, change, incident,...).
I would recommend deleting the new choice record, then re-creating it the correct way. If you already have records using this value that you don't want to mess up, you can change the table field on the sys_choice table for this record to rm_story instead of task and it should accomplish the same.
